101 SwiftUI.BindableObject with a Combine.Publisher

WWDC-swiftui-basic-binding.swift

// This is the bare-minimum you need to know to create a SwiftUI.BindableObject with a Combine.Publisher

final class MyUserData: BindableObject  {
    // this ==vvvvvvv must be a `Publisher` type
    let didChange = PassthroughSubject<MyUserData, Never>()
    
    var myProperty = false {
        didSet {
            // this ==vvvvvvv
            didChange.send(self)
        }
    }
}

// .....

struct MyView: View {
    @EnvironmentObject var userData: MyUserData
    var body: some View { ... } 
}

// .....

MyView()
   .environmentObject(MyUserData())